Скачать или смотреть Longest Consecutive Sequence | LeetCode 128| NeetCode 150 | DSA in Tamil | Arrays and hashing

In this video, I explain the Longest Consecutive Sequence problem from LeetCode in Tamil, step by step. This is perfect for Tamil-speaking coding enthusiasts who want to understand the problem deeply and learn an efficient solution.

What we cover in this video:

Problem Understanding:

Given an unsorted array of integers, find the length of the longest consecutive elements sequence.

Example: [100, 4, 200, 1, 3, 2] → Longest consecutive sequence is [1, 2, 3, 4] → Length = 4

Brute Force vs Efficient Approach:

Brute force approach: Sorting + traversal → O(n log n)

Efficient approach using HashSet → O(n) time, O(n) space

Implementation Explanation:

Convert the array into a HashSet for O(1) lookup

Iterate through each number and check if it’s the start of a sequence (i.e., num - 1 is not in the set)

Count the consecutive numbers from this start point

Keep track of the maximum length seen so far

Time & Space Complexity:

Time: O(n) — Each number is visited at most twice

Space: O(n) — HashSet stores all unique numbers

LeetCode Problem Link:https://leetcode.com/problems/longest...


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